[LiteVideo] Extend histogram expiry beyond launch of v2.

Bug: 1165080,1165079
Change-Id: Iedec5e75af5ab69bcaf444af96bef4e654b70ff5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622420
Commit-Queue: Michael Crouse <mcrouse@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Auto-Submit: Michael Crouse <mcrouse@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842154}

tools/metrics/histograms/histograms_xml/others/histograms.xml

@@ -8440,7 +8440,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="LiteVideo.HintAgent.ActiveThrottleSize" units="count"
-    expires_after="M90">
+    expires_after="M94">
   <owner>rajendrant@chromium.org</owner>
   <owner>mcrouse@chromium.org</owner>
   <summary>
@@ -8470,7 +8470,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="LiteVideo.NavigationMetrics.FrameRebufferMapSize"
-    units="count" expires_after="M90">
+    units="count" expires_after="M94">
   <owner>mcrouse@chromium.org</owner>
   <owner>rajendrant@chromium.org</owner>
   <summary>
@@ -8480,7 +8480,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="LiteVideo.OriginHints.ParseResult" enum="BooleanSuccess"
-    expires_after="M90">
+    expires_after="M94">
   <owner>mcrouse@chromium.org</owner>
   <owner>rajendrant@chromium.org</owner>
   <summary>